Here are a few of the materials you might find in a Montessori infant environment at birth and the few months following. They include the topponcino (a soft mattress pad), a black and white mobile, black and white picture cards, and various grasping materials.
This is not an all inclusive list. There are many more materials you can offer your baby than what are pictured here. For example, many people also introduce treasure baskets filled with baby-safe household items (starting around 4 months).
Aside from the topponcino, these are the materials that are typically displayed on a shelf in the infant's room.
Hope you enjoy the video.